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首页> 外文期刊>Latin American Journal of Solids and Structures >A simplified method to estimate the fundamental frequency of skew continuous multicell box-girder bridges
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A simplified method to estimate the fundamental frequency of skew continuous multicell box-girder bridges

机译：估计斜交连续多单元箱梁桥基频的简化方法

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Here Fundamental Frequency is the main factor used to calculate the vibration of a vehicle when passing across a bridge. With knowledge of the fundamental frequency, bridges can be evaluated and designed in such a manner so as to avoid the critical range of 1.5 Hz to 4.5 Hz, which is occupied by most vehicles. Therefore it is crucial to develop a reliable method to estimate the fundamental frequency of bridges. To overcome the above issue, numerical analysis combined with a theoretical method is applied to estimate the fundamental frequency of multicell box-girder bridges. The effect of span-length, number of boxes and skew angle on the estimation of this factor is discussed. Finally, reliable expressions are proposed to predict the first fundamental frequency of this type of bridge, and the accuracy of the expressions is verified. The results indicate that the fundamental frequency decreases when span length increases, due to development of crack as well as decrease stiffness of girders.
机译：此处的基本频率是用于计算车辆通过桥梁时的振动的主要因素。在了解了基本频率的情况下，可以以这样一种方式评估和设计桥梁，从而避免大多数车辆占用的1.5 Hz至4.5 Hz的临界范围。因此，开发一种可靠的方法来估算桥梁的基本频率至关重要。为了克服上述问题，将数值分析与理论方法相结合来估计多单元箱梁桥的基本频率。讨论了跨度，框数和偏斜角对该因子的估计的影响。最后，提出了可靠的表达式来预测这种桥的第一个基本频率，并验证了表达式的准确性。结果表明，随着跨度的增加，基频会降低，这是由于裂纹的发展以及梁刚度的降低。

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